Which physical system includes the constantly moving layer of gases, or blanket of air, that surrounds the planet's surface.
a) atmosphere
b) lithosphere
c) hydrosphere
d) biosphere

Read the article about the fraser river, one of the most important rivers in canada. what is the most important species of fish in this river? why are the numbers of these fish declining?

Which is not part of the definition of a family? two or more related people living together being married or in a partnership a single person living alone choices a and b

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?